<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 先请求A 再请求B 再请求C 

        function getUser(){
            
            return new Promise((resolve,reject)=>{
                console.log("A数据开始请求...");
                try{
                    // throw new Error("A错误")
                    setTimeout(() => {
                        console.log("A数据请求成功");
                        const user = {
                            username:"laoliu"
                        }
                        resolve (user)
                    }, 2000);
                }
                catch (e){
                    reject(e.message)
                }
            })
        }

        function getSex(user){
            return new Promise((resolve,reject)=>{
                console.log("B数据开始请求...");
                try{
                    // throw new Error("A错误")
                    setTimeout(() => {
                        console.log("B数据请求成功");
                        const sex = {
                            sex:"男"
                        }
                        resolve({
                            ...user,
                            ...sex
                        })
                        resolve (user)
                    }, 2000);
                }
                catch (e){
                    reject(e.message)
                }
            });
        }

        function getAge(sex){
            return new Promise((resolve,reject)=>{
                console.log("C数据开始请求...");
                try{
                    // throw new Error("C错误")
                    setTimeout(() => {
                        console.log("C数据请求成功");
                        const sex = {
                            age:18
                        }
                        resolve({
                            ...sex,
                            ...age
                        })
                        resolve (user)
                    }, 2000);
                }
                catch (e){
                    reject(e.message)
                }
            });
        }


        async function getData(){
            const user = await getUser();
            const sex = await getSex(user);
            const age = await getAge(sex);

            // 最后异步的操作 我们可以不用await 也会最后执行
            console.log("完整的数据是",age);
        }
    </script>
</body>
</html>